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I’d say Belt Squats on a proper belt squat machine. Minimal learning curve means you can get up to higher weights easier and no fear of failure means you can push harder.
With a barbell, high bar squats going as deep as you safely can. The higher bar position will balance quads/posterior chain and the longer range of motion will be more effective for building muscle than ramping up the weight and doing only half the movement.
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I know it doesn't answer your question, but if your goal with legs is predominantly size, I'd be using machines more than squats. Hack squat/leg press, leg extensions, hammy curls, calf raises. If you're set on squats I'd echo what Ptown said.
If I remember rightly you said you're trying to cut weight and get shredded at the moment. So just remember you're not going to put on size in a caloric deficit.
Which squats are the best for building bigger legs. Dumb question I know. But I’m tall and have the skinniest legs.